How to get flexibility in laravel sql query - php

Question

I want to add a sql filter where('comment_id', '=', 1) to php code
$datas = $this->model->ADD HERE->orderBy('created_at', 'DESC')->paginate(15);
Trying to add the string to code take me hours. How to make it?
Here is my code:
CommentResource.php passing the sql filter as string parameter.
<?php
class CommentResource extends BaseResource
{
public function index()
{
$filter = "where('comment_id', '=', 1)";
return parent::index_filter($filter);
}
CommentResource.php
<?php
class BaseResource extends Controller
{
protected function index_filter($filter)
{
$datas = $this->model->ADD HERE->orderBy('created_at', 'DESC')->paginate(15);
return view($this->resourceView.'.index')->with('datas', $datas);
}
}

Answer 1

As I understand you want to use different types of where as filters in your queries. That's why you want to make them dynamic. I would suggest the following solution for your task:
<?php
class CommentResource extends BaseResource
{
public function index()
{
$filter = [ 'operator' => 'where', 'args' => ['comment_id', '=', 1]];
return parent::index_filter($filter);
}
<?php
class BaseResource extends Controller
{
protected function index_filter($filter)
{
$where = $filter['operator'];
$args = $filter['args'];
$datas = $this->model->$where(...$args)->orderBy('created_at', 'DESC')->paginate(15);
return view($this->resourceView.'.index')->with('datas', $datas);
}
}
However, it will work starting from Php5.6+ because of oeprator ...

Answer 2

I am not sure if I got your requirements correctly, but if you rewrite index_filter to accept field and value separately, then you may user a regular where() from laravel:
protected function index_filter($field,$value)
{
$datas = $this->model->where($field,$value)->orderBy('created_at', 'DESC')->paginate(15);
return view($this->resourceView.'.index')->with('datas', $datas);
}
You can find the docs here. In case you really need more flexibility:
protected function index_filter($filter)
{
$datas = $this->model->whereRaw($filter)->orderBy('created_at', 'DESC')->paginate(15);
return view($this->resourceView.'.index')->with('datas', $datas);
}
Have in mind though that this is really dangerous, as you expose the possibility to inject malicious code, it should be definitely properly escaped beforehand.

Answer 3

My latest code works right. I'll post here.
<?php
class CommentResource extends BaseResource
{
public function index()
{
$options = [
'filters'=>[
[ 'operator' => 'where',
'args' => [
[ 'article_id', '=', $article_id ],
[ 'comment_id', '=', $comment_id ],
// add filter args...
],
],
// add filter operators here...
],
'sorts' => [
'column' => $sortColumn, // change sort column...
'order' => $sortOrder, // change sort order...
],
];
return parent::index_filter($options);
}
<?php
class BaseResource extends Controller
{
protected function index_filter($options, $number=15)
{
$result = $this->model;
foreach ($options['filters'] as $filter) {
$operator = $filter['operator'];
$args = $filter['args'];
$result = $result->$operator($args);
}
if ( $options['sorts'] != [] ) {
$column = $options['sorts']['column'];
$order = $options['sorts']['order'];
$result = $result->orderBy($column, $order);
}
return $result->paginate($number);
}
}
The reason I change ...$args to $args is, when 'args' has more than on value, for example,
'args' => [
[ 'article_id', '=', $article_id ],
[ 'comment_id', '=', $comment_id ],
// add filter args...
],
...$args will change 'args' to one array, but $args will remain 'args' as nest array, which is the operator 'where' want.